The device has a maximal ratio transmission (MRT) interference detection unit connected to a radio frequency (RF) telemetry communication unit (260) or a RF antenna (230) by a frequency diplexer (240). A demodulation unit of the MRT interference detection unit detects RF rotary fields typical for MRT and transmits an MRT detection signal from the MRT detection unit to a treatment control unit (220), where the RF communication unit is in conjunction with the RF antenna to allow communication between an external programming device and an implantable medical device. An independent claim is also included for a method for detecting electromagnetic interferences generated by MRT devices in an implantable medical device.